CVE-2026-2352: Optimizingmatters Autoptimize

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The Autoptimize plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ao_post_preload' meta value in all versions up to, and including, 3.1.14. This is due to insufficient input sanitization in the `ao_metabox_save()` function and missing output escaping when the value is rendered into a `<link>` tag in `autoptimizeImages.php`. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page, granted the "Image optimization" or "Lazy-load images" setting is enabled in the plugin configuration.

Affected products

• Optimizingmatters Autoptimize: up to and including 3.1.14

Published 2026-03-21. Last modified 2026-06-17.